import junit.framework.TestCase;
public class IntNumberTest extends TestCase {

	    public void testAdd () {
		            assertEquals(25, 20 + 5);
			            assertEquals(-3,-12 + 9);
				            assertEquals(-7,-2 + (-5));
					        }

	        public void testSubtract () {
			        assertEquals(14, 24 - 10);
				        assertEquals(-3,14 - 17);
					        assertEquals(-12,0 - 12);
						    }

		    public void testMultiply () {
			            assertEquals(100, 25 * 4);
				            assertEquals(0,0 * 0);
					            assertEquals(-100,25 * (-4));
						        }

		        public void testDivide () {
				        assertEquals(10, 100 / 10);
					        assertEquals(0,0 / 10);
						        assertEquals(-10,100/ (-10));
							    }


}
